3iE Energy-Monitoring Thermostat

Quick Menu

What does it mean if my thermostat reads error message “ER1” on the display?

The ER1 message will occur if no floor sensor is connected to the thermostat. Have your electrician make sure that the sensor probe wires are securely connected in ports 1 and 2 of the thermostat. If sensor was not installed, your thermostat can be programmed to read the air temperature instead by following the steps below.

Menu > Settings > Set Heating Target > Target Air Temperature